Installation, Operation, and Maintenance

Transcription

1 Installation, Operation, and Maintenance IntelliPak Commercial Rooftop Air Handlers with CV, VAV, or SZVAV Controls Models: "H or 2" and later Design Sequence WEHE Casings 2, 3, 4, 5, 6 & 9 (4,000-46,000 cfm) WFHE Casings 2, 3, 4, 5, 6 & 9 (4,000-46,000 cfm) WLHE Casings 2, 3, 4, 5, 6 & 9 (4,000-46,000 cfm) WSHE Casings 2, 3, 4, 5, 6 & 9 (4,000-46,000 cfm) WXHE Casings 2, 3, 4, 5, 6 & 9 (4,000-46,000 cfm) SAFETY WARNING Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment. May 2012 RT-SVX35G-EN

2 Warnings, Cautions and Notices Warnings, Cautions and Notices. Note that warnings, cautions and notices appear at appropriate intervals throughout this manual. Warnings are provide to alert installing contractors to potential hazards that could result in death or personal injury. Cautions are designed to alert personnel to hazardous situations that could result in personal injury, while notices indicate a situation that could result in equipment or property-damage-only accidents. Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions. Read this manual thoroughly before operating or servicing this unit. must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them. WARNING Proper Field Wiring and Grounding Required! All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state electrical codes. Failure to follow code could result in death or serious injury. ATTENTION: Warnings, Cautions and Notices appear at appropriate sections throughout this literature. Read these carefully: WARNING CAUTIONs NOTICE: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices. Indicates a situation that could result in equipment or property-damage only Important Environmental Concerns! Scientific research has shown that certain man-made chemicals can affect the earth s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment.trane advocates the responsible handling of all refrigerants-including industry replacements for CFCs such as HCFCs and HFCs. Responsible Refrigerant Practices! Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified. The Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that WARNING Personal Protective Equipment (PPE) Required! Installing/servicing this unit could result in exposure to electrical, mechanical and chemical hazards. Before installing/servicing this unit, technicians MUST put on all Personal Protective Equipment (PPE) recommended for the work being undertaken. ALWAYS refer to appropriate MSDS sheets and OSHA guidelines for proper PPE. When working with or around hazardous chemicals, ALWAYS refer to the appropriate MSDS sheets and OSHA guidelines for information on allowable personal exposure levels, proper respiratory protection and handling recommendations. If there is a risk of arc or flash, technicians MUST put on all Personal Protective Equipment (PPE) in accordance with NFPA 70E or other country-specific requirements for arc flash protection, PRIOR to servicing the unit. Failure to follow recommendations could result in death or serious injury. WARNING R-410A Refrigerant under Higher Pressure than R-22! The units described in this manual use R-410A refrigerant which operates at higher pressures than R- 22 refrigerant. Use ONLY R-410A rated service equipment or components with these units. For specific handling concerns with R-410A, please contact your local Trane representative. Failure to use R-410A rated service equipment or components could result in equipment exploding under R-410A high pressures which could result in death, serious injury, or equipment damage. 2012Trane All rights reserved RT-SVX35G-EN

3 Warnings, Cautions and Notices Overview of Manual Note: One copy of this service literature ships inside the control panel of each unit. This booklet describes proper installation, start-up, operation, and maintenance procedures for W_HE Casings 2 through 9 Rooftop Air Handlers designed for Constant Volume (CV) and Variable Air Volume (VAV) applications. By carefully reviewing the information within this manual and following the instructions, the risk of improper operation and/or component damage will be minimized. Important: The procedures discussed in this manual should only be performed by qualified, experienced HVAC technicians. It is important that periodic maintenance be performed to help assure trouble free operation. Should equipment failure occur, contact a qualified service organization with qualified, experienced HVAC technicians to properly diagnose and repair this equipment. These units are available with an optional electronic Unit Control Module (UCM) network which provides operating functions that are significantly different than conventional units. Refer to the "Start-Up" and "Test Mode" procedures within this Installation, Operation, & Maintenance manual and the latest edition of the appropriate SAHF-PTG manual for CV orvav applications before attempting to operate or service this equipment. Unit Record Information For future reference, you may find it helpful to record the unit data requested below in the blanks provided. 1. Complete Unit Model Number: 2. Unit Serial Number: 3. Unit DL Number ( design special units only): 4. Wiring Diagram Numbers (from unit control panel): schematics: connection(s): 5. Unit Address (TCI): 6. Network ID LCI/ BCI: RT-SVX35G-EN 3

4 Table of Contents Overview of Manual... 3 Model Number Descriptions... 5 General Information... 7 Unit Nameplate Locations... 7 Precautionary Measures... 7 Commonly Used Acronyms... 7 Unit Description... 7 Constant Volume (CV) Units Variable Air Volume (VAV) Units Installation Unit Inspection Storage Unit Clearances Unit Dimensions & Weight Information. 16 Roof Curb and Ductwork Pitch Pocket Location Unit Rigging & Placement General Unit Requirements Main Electrical Power Requirements Field Installed Control Wiring Requirements for Electric Heat Units Requirements for Gas Heat Requirements for Hot Water Heat (WLHE) 31 Requirements for Steam Heat (WSHE).. 31 O/A Pressure Sensor and Tubing Installation Condensate Drain Connection Shipping Fasteners O/A Sensor & Tubing Installation Gas Heat Units (WFHE) Modulating Steam Heat Units (WSHE) Chilled Water Units Disconnect Switch External Handle (Factory Mounted Option) Electric Heat Units (WEHE) Power Wire Sizing and Electrical Service Sizing Equations Constant Volume System Controls Variable Air Volume System Controls...49 Constant Volume or Variable Air Volume System Controls...49 System Start-up...64 Cooling Sequence of Operation (IntelliPak Controls Only)...64 Gas Heating Sequence of Operation...65 Modulating Gas Sequence of Operation.66 Voltage Supply and Voltage Imbalance..74 Verifying Proper Fan Rotation...75 System Airflow Measurements...76 Variable Air Volume Systems...77 Exhaust Airflow Measurement (Optional with all Units)...78 Traq Sensor Airflow Measurement (Optional with all units equipped with an economizer)...79 Economizer Damper Adjustment...89 Thermostatic Expansion Valves...92 Electric, Steam and Hot Water Start-Up (Constant Volume & Variable Air Volume Systems)...92 Gas Furnace Start-Up...93 Two Stage Gas Furnace...93 Heat Exchanger...96 Unit Control...96 Limited Modulating Gas Furnace...97 Service & Maintenance...99 VFD Programming Parameters Fan Belt Adjustment Monthly Maintenance Wiring Matrix Warranty and Liability Clause Commercial Equipment Rated 20 Tons and Larger and Related Accessories Index RT-SVX35G-EN

5 Model Number Descriptions W F H E P C 4 8 D A 0 W DIGIT 1 UNIT TYPE W = Air Handler Casing DIGIT 2 UNIT FUNCTION E = Electric Heat F = Natural Gas Heat L = Hot Water Heat S = Steam Heat X = No Heat, Extended Casing DIGIT 3 UNIT AIRFLOW H = Single Zone DIGIT 4 DEVELOPMENT SEQUENCE E = R-410A DIGITS 5 UNIT SIZE 2 = cfm 3 = ,500 cfm 4 = ,000 cfm 5 = 10,000-22,500 cfm 6 = 14,000-27,000 cfm 9 = 27,000-46,000 cfm DIGIT 6 COOLING COIL - NUMBER OF ROWS 0 = No Cooling Coil 2 = 2 Row Chilled Water 4 = 4 Row Chilled Water 6 = 6 Row Chilled Water E = R-410A DX Coil Note: Valve type and size required when ordering DIGIT 7 COOLING COIL - FIN SERIES 0 = No Chilled Water Coil A = Series 80 w/oturbulators B = Series 80 w/turbulators C = Series 108 w/oturbulators D = Series 108 w/turbulators E = Series 144 w/oturbulators F = Series 144 w/turbulators G = Series 168 w/oturbulators H = Series 168 w/turbulators DIGIT 7A COOLING VALVE 0 = No Cooling = 1.5 Cooling Valve (29.3 Cv) % = 2 Cooling Valve (40 Cv) $ = 2.5 Cooling Valve (63 Cv) - = 3 Cooling Valve (100 Cv) DIGIT 8 MAIN POWER SUPPLY E = 200/60/3 F = 230/60/3 4 = 460/60/3 5 = 575/60/3 DIGIT 9 HEATING CAPACITY Note: When the second digit calls for F (Gas Heat), the following values apply: H = High Heat-2-Stage (All Casing Sizes) L = Low Heat-2-Stage (Casing Sizes 2-6) 0 = No Heat (All Casing Sizes) J = High Heat-Limited Modulation (All Casing Sizes) G = Low Heat-Limited Modulation (Casing Sizes 5&6) P = High Heat-Full Modulation (All Casing Sizes) M = Low Heat-Full Modulation (Casing Sizes 5&6) Note: When the second digit calls for E (electric heat), the following values apply: D = 30 kw H = 50 kw L = 70 kw N = 90 kw Q = 110 kw R = 130 kw U = 150 kw V = 170 kw W = 190 kw Note: When the second digit calls for L (Hot Water) or S (Steam) Heat, one of the following valve size values must be in Digit 9: High Heat Coil: 1 =.50 (4.7 Cv) 2 =.75 (7.3 Cv) 3 = 1 (11.7 Cv) 4 = 1.25 (18.7 Cv) 5 = 1.5 (29.3 Cv) 6 = 2 (46.8 Cv) Low Heat Coil: A =.50 (4.7 Cv) B =.75 (7.3 Cv) C = 1 (11.7 Cv) D = 1.25 (18.7 Cv) E = 1.5 (29.3 Cv) F = 2 (46.8 Cv) DIGIT 10 DESIGN SEQUENCE A = First (Factory Assigned) Note: Sequence may be any letter A thru Z. DIGIT 11 EXHAUST OPTION 0 = None 1 = Barometric 3 = 100%, 3 hp w/statitrac 4 = 100%, 5 hp w/statitrac 5 = 100%, 7.5 hp w/statitrac 6 = 100%, 10 hp w/statitrac 7 = 100%, 15 hp w/statitrac 8 = 100%, 20 hp w/statitrac B = 50%, 3 hp C = 50%, 5 hp D = 50%, 7.5 hp F = 100%, 3 hp w/o Statitrac G = 100%, 5 hp w/o Statitrac (CV Only) H = 100%, 7.5 hp w/o Statitrac J = 100%, 10 hp w/o Statitrac K = 100%, 15 hp w/o Statitrac (CV Only) L = 100%, 20 hp w/o Statitrac (CV Only) DIGIT 12 EXHAUST AIR FAN DRIVE 0 = None 4 = 400 rpm 5 = 500 rpm 6 = 600 rpm 7 = 700 rpm 8 = 800 rpm 9 = 900 rpm A = 1000 rpm B = 1100 rpm DIGIT 13 FILTER A = Throwaway B = Cleanable Wire Mesh C = High-EfficiencyThrowaway D = Bag With Prefilter, MERV 14 E = Cartridge With Prefilter, MERV 14 F = Throwaway Filter Rack Less Filter Media G = Bag Filter Rack Less Filter Media DIGIT 14 SUPPLY AIR FAN HP Casing Sizes 2-6Only 1 = 3 hp 2 = 5 hp 3 = 7.5 hp 4 = 10 hp 5 = 15 hp 6 = 20 hp 7 = 25 hp 8 = 30 hp 9 = 40 hp A = 50 hp Casing Size 9 Only C = 30 HP (2-15 HP) D = 40 HP (2-20 HP) E = 50 HP (2-25 HP) F = 60 HP (2-30 HP) G = 80 HP (2-40 HP) RT-SVX35G-EN 5

6 Model Number Descriptions DIGIT 15 SUPPLY AIR FAN DRIVE 4 = 400 rpm 5 = 500 rpm 6 = 600 rpm 7 = 700 rpm 8 = 800 rpm 9 = 900 rpm A = 1000 rpm B = 1100 rpm C = 1200 rpm D = 1300 rpm E = 1400 rpm F = 1500 rpm G = 1600 rpm H = 1700 rpm DIGIT 16 FRESH AIR A = No Fresh Air B = 0-25% Manual D = 0-100% Economizer DIGIT 17 SYSTEM CONTROL 0 = No Controller 1 = CV - ZoneTemperature Control 2 = CV - DischargeTemperature Control 3 = VAV DischargeTemperature Control 4 = CV - ZoneTemperature Control Space Pressure Control with Exhaust/Return VFD w/o Bypass 5 = CV - ZoneTemperature Control Space Pressure Control with Exhaust/Return VFD and Bypass 6 = VAV DischargeTemperature Control with VFD w/o Bypass 7 = VAV DischargeTemperature Control with VFD and Bypass 8 = VAV DischargeTemperature Control Supply and Exhaust Fan with VFD w/o Bypass 9 = VAV DischargeTemperature Control Supply and Exhaust Fan with VFD and Bypass DIGIT 18 ZONE SENSOR 0 = Without Accessory Panel A = Dual Setpoint Changeover Zone Sensor (BAYSENS108*) B = Changeover Zone Sensor w/ System Lights (BAYSENS110*) C = Room Zone Sensor w/ Override (BAYSENS073*) D = Room Zone Sensor w/ Local Setpoint (BAYSENS074*) L = Programmable Zone Sensor w/ System Function Lights for both CV & VAV (BAYSENS119*) DIGIT 19 AIRFLOW CONFIGURATION D = Downflow - Normal Unit Configuration U = Upflow (Not available with Electric Heat) H = Horizontal (Not available with Electric Heat) DIGIT 20 AGENCY APPROVAL 0 = None 1 = culus DIGITS MISCELLANEOUS 21 A = Unit Disconnect Switch 22 B = Hot Gas Bypass 23 0 = Without Economizer 23 C = Economizer Control w/comparative Enthalpy 23 Z = Economizer Control w/reference Enthalpy 23 W= Economizer Control w/dry Bulb 24 E = Low Leak Fresh Air Dampers 25 F = High DuctTemperature Thermostat 26 * = *Factory Use Only 27 J =Temperature Sensor 28 K = Generic BAS Module 30 M= Remote Human Interface 31 N = Ventilation Override Module 32 P = Remote Room Sensor 33 R = Extended Grease Lines 34 T = Access Doors 35 U = Remote Potentiometer 36 V = Inter-Processor Comm Bridge 37 Y =Trane communication interface (TCI) module 37 7 =Trane Lontalk communication interface (LCI) module 37 M=Trane BACnet Communication interface (BCI) Module 39 3 = Retrofit Wall Mount Plate 40 4 = Hz to Vertical Wall mount Plate 41 6 = Factory-Power 15A GFI Conv. Outlet 42 8 = 2" (51mm) Spring Isolators Tip: EXAMPLE Model number: WFHE4004P058C48D3000A0W describes an air handler with the following characteristics: DX cooling with natural gas heating, casing size 4, 460/60/3 power supply, high heat model. 100 percent exhaust with Statitrac, 7.5 HP exhaust fan motor with drive selection No. 8 (800 RPM), high-efficiency throwaway filters, 10 HP supply fan motor with drive selection No. 8 (800 RPM), 0-100% economizer with dry bulb control, VAV discharge temperature control, no remote panel, downflow airflow configuration and unit mounted disconnect switch. 6 RT-SVX35G-EN

7 General Information Unit Nameplate Locations One Mylar nameplate is located on the outside upper left corner of the control panel door. It includes the model number, serial number, electrical characteristics, weight, as well as other pertinent unit data. A small metal nameplate with the model number, serial number, and unit weight is located just above the Mylar nameplate. A third nameplate is located on the inside of the control panel. Precautionary Measures WARNING Fiberglass Wool! Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance or repair will expose you to airborne particles of glass wool fibers and ceramic fibers known to the state of California to cause cancer through inhalation. You MUST wear all necessary Personal Protective Equipment (PPE) including gloves, eye protection, mask, long sleeves and pants when working with products containing fiberglass wool. Exposition to glass wool fibers without all necessary PPE equipment could result in cancer, respiratory, skin or eye irritation, which could result in death or serious injury. 1. Avoid breathing fiberglass dust. 2. Use a NIOSH approved dust/mist respirator. 3. Avoid contact with the skin or eyes.wear long-sleeved, loose-fitting clothing, gloves, and eye protection. 4. Wash clothes separately from other clothing: rinse washer thoroughly. 5. Operations such as sawing, blowing, tear-out, and spraying may generate fiber concentrations requiring additional respiratory protection. Use the appropriate NIOSH approved respiration in these situations. First Aid Measures Eye Contact - Flush eyes with water to remove dust. If symptoms persist, seek medical attention. Skin Contact - Wash affected areas gently with soap and warm water after handling. Commonly Used Acronyms For convenience, a number of acronyms and abbreviations are used throughout this manual. These acronyms are alphabetically listed and defined below. BAS = Building automation systems BCI = BACnet Communication Interface module cfm = Cubic-feet-per-minute CKT = Circuit CV = Constant volume CW = Clockwise CCW = Counterclockwise E/A = Exhaust air ECEM = Exhaust/comparative enthalpy module F/A = Fresh air GBAS = Generic building automation system HGBP = Hot gas bypass HI = Human Interface HVAC = Heating, ventilation and air conditioning I/O = Inputs/outputs IOM = Installation/operation/ maintenance manual IPC = Interprocessor communications IPCB = Interprocessor communications bridge LCI-I = LonTalk Communication Interface for IntelliPak LH = Left-hand MCM = Multiple compressor module MWU = Morning warm-up NSB = Night setback O/A = Outside air psig = Pounds-per-square-inch, gauge pressure R/A = Return air RH = Right-hand rpm = Revolutions-per-minute RT = Rooftop unit RTM = Rooftop module S/A = Supply air SCM = Single circuit module SZ = Single-zone (unit airflow) SZVAV = Single zone variable air volume TCI =Tracer communications module UCM = Unit control modules VAV = Variable air volume VCM = Ventilation control module VOM = Ventilation override module w.c. = Water column XL = Across-the-line start Unit Description EachTrane Commercial, Single-zone Rooftop Air Handler is fully assembled and the applicable controls are tested for proper operation before shipment. Units ordered with direct expansion (DX) evaporator coils are leak-tested, evacuated and a Nitrogen holding charge of 30 psig is added.an optional roof curb for the W_HE units are available fromtrane. The roof curb kit must be field assembled and installed according to the latest edition of RT-SVN14*-EN. Trane Commercial Rooftop Air Handlers (when ordered with IntelliPak controls) are controlled by a microelectronic control system. The network of modules and their operation are significantly different than conventional units and are referred to as Unit Control RT-SVX35G-EN 7

8 General Information Modules (UCM). The acronym UCM is used extensively throughout this document when referring to the control system network. These modules through Proportional/Integral control algorithms perform specific unit functions which provide the best possible comfort level for the customer. They are mounted in the control panel and are factory wired to their respective internal components. They receive and interpret information from other unit modules, sensors, remote panels, and customer binary contacts to satisfy the applicable request for economizing, mechanical cooling, heating, and ventilation. Refer to the Table 1. RTM resistance input vs. setpoint temperatures following discussion for an explanation of each module function. Rooftop Module (RTM - 1U48) The Rooftop Module (RTM) responds to cooling, heating, and ventilation requests by energizing the proper unit components based on information received from other unit modules, sensors, remote panels, and customer supplied binary inputs. It initiates supply fan, exhaust fan, exhaust damper, variable frequency drive output, and economizer operation based on that information. RTM cooling or heating setpoint input used as the source for a Zone temp setpoint ( F) RTM cooling setpoint input used as the source for SUPPLY AIR temp setpoint cooling ( F) Resistance (Ohms) Max. Tolerance 5% n/a n/a RT-SVX35G-EN

9 General Information Table 2. RTM resistance value vs. system operating mode Resistance applied to RTM MODE input Terminals (Ohms) Max. Tolerance 5% Constant Volume Units Fan Mode System Mode 2320 Auto Off 4870 Auto Cool 7680 Auto Auto On Off On Cool On Auto Auto Heat On Heat Compressor Module (SCM & MCM - 1U49) The Compressor module, (Single Circuit & Multiple Circuit), upon receiving a request for mechanical cooling, energizes the appropriate compressors and condenser fans. It monitors the compressor operation through feedback information it receives from various protection devices. Human Interface Module (HI - 1U65) The Human Interface module enables the operator to adjust the operating parameters for the unit using it's 16 key keypad. The 2 line, 40 character LCD screen provides status information for the various unit functions as well as menus for the operator to set or modify the operating parameters. Heat Module (1U50 used on heating units) The Heat module, upon receiving a request for Heating, energizes the appropriate heating stages or strokes the Modulating Heating valve as required. Ventilation Override Module (VOM - Optional 1U51) Important: The ventilation override system should not be used to signal the presence of smoke caused by a fire as it is not intended nor designed to do so. The Ventilation Override module initiates specified functions such as; space pressurization, exhaust, purge, purge with duct pressure control, and unit off when any one of the five (5) binary inputs to the module are activated. The compressors and condenser fans are disabled during the ventilation operation. If more than one ventilation sequence is activated, the one with the highest priority is initiated. Interprocessor Communications Board (IPCB - Optional 1U55 used with the Remote Human Interface) The Interprocessor Communication Board expands communications from the rooftop unit's UCM network to a Remote Human Interface Panel. DIP switch settings on the IPCB module for this application should be; Switches 1 and 2 "Off", Switch 3 "On". Trane Communications Interface Module (TCI - Optional 1U54 used on units with Trane ICS ) TheTrane Communication Interface module expands communications from the unit UCM network to atrane Tracer 100 or atracer Summit system and allows external setpoint adjustment and monitoring of status and diagnostics. DIP Switch settings on thetci module for these applications should be: Tracer 100 (Comm3): Switches 1, 2, and 3 are "Off"; Tracer Summit (Comm4): Switch 1 is "On", switches 2 and 3 are "Off" Lontalk/BACnet Communication Interface Module (LCI/BCI - Optional1U54/1U104 - used on units with Trane ICS or 3rd party Building Automation Systems) The Lontalk/BACnet Communication Interface modules expand communications from the unit UCM network to a TraneTracer Summit or a 3rd party building automation system, and allow external setpoints and configuration adjustments and monitoring of status and diagnostics. Exhaust/Comparative Enthalpy Module (ECEM - Optional 1U52 used on units with Statitrac and/or comparative enthalpy options) The Exhaust/Comparative Enthalpy module receives information from the return air humidity sensor, the outside air humidity sensor, and the return air temperature sensor to utilize the lowest possible humidity level when considering economizer operation. In addition, it receives space pressure information which is used to maintain the space pressure to within the setpoint control band. Refer to Figure 1, p. 12 for the humidity vs voltage input values. Volts Relative Humidity vs Voltage Percent Relative Humidity RT-SVX35G-EN 9

10 General Information Ventilation Control Module (VCM - Design special option only) The Ventilation Control Module (VCM) is located in the filter section of the unit and is linked to the unit's UCM network. Using a "velocity pressure" sensing ring located in the fresh air section, allows the VCM to monitor and control the quantity of fresh air entering the unit to a minimum airflow setpoint. An optional temperature sensor can be connected to the VCM which enables it to control a field installed fresh air preheater. An optional CO 2 sensor can be connected to the VCM to control CO 2 reset.the reset function adjust the minimum cfm upward as the CO 2 concentrations increase.the maximum effective (reset) setpoint value for fresh air entering the unit is limited to the systems operating cfm. Table 3 lists the Minimum Outside Air cfm vs Input Voltage. Table 3. Minimum outside air cfm vs input voltage Minimum Outside Air Setpoint w/vcm Module & Traq Sensing Casing Input Volts CFM vdc vdc vdc vdc vdc vdc Note: Refer to the "Traq Sensor Sequence of Operation" section for VCM operation. Velocity Pressure Transducer/Solenoid Assembly Generic Building Automation System Module (GBAS - Optional 1U51 used with non-trane building control systems) The Generic Building Automation System (GBAS) module allows a non-trane building control system to communicate with the rooftop unit and accepts external setpoints in form of analog inputs for cooling, heating, supply air pressure, and a binary input for demand limit. Refer to the "Field Installed ControlWiring" section (p. 49), for the input wiring to the GBAS module (Figure 36, p. 61) and the various desired setpoints (Table 16, p. 61) with the corresponding DC voltage inputs for both VAV and CV applications. For complete application details of the module, refer to Engineering Bulletin UN-PRB001-EN. Input Devices & System Functions The descriptions of the following basic Input Devices used within the UCM network are to acquaint the operator with their function as they interface with the various modules. Refer to the unit's electrical schematic for the specific module connections. Constant Volume & Variable Air Volume Units Supply Air Temperature Sensor (3RT9) Is an analog input device used with CV &VAV applications. It monitors the supply air temperature for; supply air temperature control (VAV), supply air temperature reset (VAV), supply air temperature low limiting (CV), supply air tempering (CV/VAV). It is mounted in the supply air discharge section of the unit and is connected to the RTM (1U48). Return Air Temperature Sensor (3RT6) Is an analog input device used with a return humidity sensor on CV & VAV applications when the comparative enthalpy option is ordered. It monitors the return air temperature and compares it to the outdoor temperature to establish which temperature is best suited to maintain the cooling requirements. It is mounted in the return air section and is connected to the ECEM (1U52). Entering Evaporator Temperature Sensor (3RT28 and 3RT29) This analog input device is used with the Leaving EvaporatorTemp sensor to provide Low Charge Protection of the refrigerant systems. The difference in these two temperatures will be monitored during compressor operation and compressor circuits will be shut down if this difference exceeds a Human Interface selectable setpoint value. Leaving Evaporator Temperature Sensor (3RT14 and 3RT15) An analog input device used with CV andvav applications that monitors the refrigerant temperature inside the evaporator coil to prevent coil freezing. It is attached to the suction line near the evaporator coil and is connected to the MCM. It is factory set for 30 F and has an adjustable range of 25 F to 35 F.The compressors are staged "Off" as necessary to prevent icing. After the last compressor stage has been turned "Off", the compressors will be allowed to restart once the evaporator temperature rises 10 F above the "coil frost cutout temperature" and the minimum three minute "Off" time has elapsed. Filter Switch (3S21) Is a binary input device used on CV & VAV applications. It measures the pressure differential across the unit filters. It is mounted in the filter section and is connected to the RTM (1U48). A diagnostic SERVICE signal is sent to the remote panel if the pressure differential across the filters is at least 0.5" w.c. The contacts will automatically open when the pressure differential across the filters decrease to 0.4" w.c. The switch differential can be field adjusted between 0.17" w.c. to 5.0" w.c. ± 0.05" w.c. 10 RT-SVX35G-EN

11 General Information Supply and Exhaust Airflow Proving Switches (3S68 and 3S69) 3S68 is a binary input device used on CV & VAV applications to signal the RTM when the supply fan is operating. It is located in the supply fan section of the unit and is connected to the RTM (1U48). During a request for fan operation, if the differential switch is detected to be open for 40 consecutive seconds; compressor operation is turned "Off", heat operation is turned "Off", the request for supply fan operation is turned "Off" and locked out, exhaust dampers (if equipped) are "closed", economizer dampers (if equipped) are "closed", and a manual reset diagnostic is initiated. 3S69 is a binary input device used on all rooftop units equipped with an exhaust fan. It is located in the exhaust fan section of the unit and is connected to the RTM (1U48). During a request for fan operation, if the differential switch is detected to be open for 40 consecutive seconds, the economizer is closed to the minimum position setpoint, the request for exhaust fan operation is turned "Off" and locked out, and a manual reset diagnostic is initiated.the fan failure lockout can be reset; at the Human Interface located in the unit's control panel, bytracer, or by cycling the control power to the RTM (1S70 Off/On). Supply and Exhaust Fan Circuit Breakers (1CB1, 1CB2) The supply fan and exhaust fan motors are protected by circuit breakers 1CB1 and 1CB2 respectively.they will trip and interrupt the power supply to the motors if the current exceeds the breaker's "must trip" value. The rooftop module (RTM) will shut all system functions "Off" when an open fan proving switch is detected. Saturated Condenser Temperature Sensors (2RT1 and 2RT2) Are analog input devices used on CV & VAV applications mounted inside a temperature well located on a condenser tube bend. They monitor the saturated refrigerant temperature inside the condenser coil and are connected to the SCM/MCM (1U49). As the saturated refrigerant temperature varies due to operating conditions, the condenser fans are cycled "On" or "Off" as required to maintain acceptable operating pressures. Outdoor Air Humidity Sensor (3U63) Is an analog input device used on CV & VAV applications with 100% economizer. It monitors the outdoor humidity levels for economizer operation. It is mounted in the fresh air intake section and is connected to the RTM (1U48). Return Air Humidity Sensor (3U64) Is an analog input device used on CV & VAV applications with the comparative enthalpy option. It monitors the return air humidity level and compares it to the outdoor humidity level to establish which conditions are best suited to maintain the cooling requirements. It is mounted in the return air section and is connected to the ECEM (1U52). Status/Annunciator Output Is an internal function within the RTM (1U48) module on CV & VAV applications that provides: diagnostic and mode status signals to the remote panel (LEDs) and to the Human Interface. control of the binary Alarm output on the RTM. control of the binary outputs on the GBAS module to inform the customer of the operational status and/or diagnostic conditions. Space Pressure Transducer (3U62) Is an analog input device used on CV & VAV applications with the Statitrac option. It modulates the exhaust dampers to keep the space pressure within the building to a customer designated controlband. It is mounted in the filter section just above the exhaust damper actuator and is connected to the ECEM (1U52). Field supplied pneumatic tubing must be connected between the space being controlled and the transducer assembly. Volts Transducer Voltage Output vs Pressure Input Pressure (inches w.c.) Morning Warm-Up - Zone Heat When a system changes from an unoccupied to an occupied mode with the MWU option, the unit heater or external heat (i.e. VAV reheat boxes) will be brought on if the space temperature is below the MWU setpoint. The heat will remain on until the temperature reaches the MWU setpoint. Supply Air Temperature Low Limit Uses the supply air temperature sensor input to modulate the economizer damper to minimum position in the event the supply air temperature falls below the occupied heating setpoint temperature. Freezestat (4S12) Is a binary input device used on CV & VAV units with Hydronic Heat. It is mounted in the heat section and connected to the Heat Module (1U50). If the temperature of the air entering the heating coil falls to 40 F, the normally open contacts on the freezestat closes signalling the Heat Module (1U50) and the Rooftop Module (RTM) to: RT-SVX35G-EN 11

12 General Information a. drive the Hydronic Heat Actuator (4U15) to the full open position. b. turn the supply fan "Off". c. closes the outside air damper; d. turns "On" the SERVICE light at the Remote Panel. e. initiates a "Freezestat" diagnostic to the Human Interface. High Duct Temp Thermostats (Optional 3S16 and 3S17) Are binary input devices used on CV & VAV applications with a Trane Communication Interface Module (TCI).They provide "high limit" shutdown of the unit and requires a manual reset.they are factory set to open if the supply air temperature reaches 240 F, or the return air temperature reaches 135 F. Once tripped, the thermostat can be reset by pressing the button located on the sensor once the air temperature has decreased approximately 25 F below the cutout point. Chilled Water Valve Control The 0 to 10 VDC output from the heat module doubles as the chilled water controller.the unit has isolating relays to switch between heat and cool. Constant Volume (CV) Units Zone Temperature - Cooling Relies on input from a sensor located directly in the space, while a system is in the occupied "Cooling" mode. It modulates the economizer (if equipped) and/or stages the mechanical cooling "On and Off" as required to maintain the zone temperature to within the cooling setpoint deadband. Zone Temperature - Heating Relies on input from a sensor located directly in the space, while a system is in the occupied "Heating" mode or an unoccupied period, to stage the heat "on and off" or to modulate the heating valve (hydronic heat only) as required to maintain the zone temperature to within the heating setpoint deadband. The supply fan will be requested to operate any time there is a requested for heat. On gas heat units, the fan will continue to run for 60 seconds after the furnace is turned off. Supply Air Tempering On CV units equipped with heat, if the supply air temperature falls 10 F below the occupied heating setpoint temperature while the heater is "Off", the first stage of heat will be turned "On".The heater is turned "Off" when the supply air temperature reaches 10 F above the occupied heating setpoint temperature. Variable Air Volume (VAV) Units Occupied Heating - Supply Air Temperature When avav units is equipped with "Modulating Heat", and the system is in an occupied mode, and the field supplied changeover relay contacts (5K87) have closed, the supply air temperature will be controlled to the customer specified supply air heating setpoint. It will remain in the heating status until the changeover relay contacts are opened. Occupied Cooling - Supply Air Temperature When a VAV unit is in the occupied mode, the supply air temperature will be controlled to the customers specified supply air cooling setpoint by modulating the economizer and/or staging the mechanical cooling "On and Off" as required.the changeover relay contacts must be open on units with "Modulating Heat" for the cooling to operate. Daytime Warm-up On VAV units equipped with heat, if the zone temperature falls below the daytime warm-up initiate temperature during the occupied mode, the system will switch to the unoccupied mode and stage the heat "On" to control to the occupied heating setpoint. When the zone temperature reaches the daytime warm-up termination setpoint, the heat will be turned "Off" and the system will transition to the occupied mode. Unoccupied Heating - Zone Temperature When a VAV unit is equipped with Gas, Electric, or hydronic heat and is in an unoccupied mode, the zone temperature will be controlled to within the customers specified setpoint deadband. Supply Air Tempering On VAV units equipped with "Modulating Heat", if the supply air temperature falls 10 F below the supply air temperature setpoint, the hydronic heat valve will modulate to maintain the supply air temperature to within the low end of the setpoint deadband. Supply Duct Static Pressure Control (Occupied) The RTM relies on input from the duct pressure transducer when a unit is equipped with avariable Frequency Drive to position the supply fan speed to maintain the supply duct static pressure to within the static pressure setpoint deadband. Refer to the Transducer Voltage Output vs Pressure Input values listed in the Space Pressure Transducer (3U62) section, (p. 11.) Single Zone Variable Air Volume (SZVAV) Only The IntelliPak controls platform will support Single Zone VAV as an optional unit control type in order to meet ASHRAE 90.1.The basic control will be a hybrid VAV/CV configured unit that provides discharge temperature control to a varying discharge air temperature target 12 RT-SVX35G-EN

13 General Information setpoint based on the space temperature and/or humidity conditions. Concurrently, the unit will control and optimize the supply fan speed to maintain the zone temperature to a zone temperature setpoint. Supply Fan Output Control Units configured for Single Zone VAV control will utilize the same supply fan output control scheme as on traditional VAV units except the VFD signal will be based on zone heating and cooling demand instead of the supply air pressure. VFD Control Single Zone VAV units will be equipped with a VFDcontrolled supply fan which will be controlled via a 0-10VDC signal from the Rooftop Module (RTM). With the RTM supply fan output energized and the RTMVFD output at 0VDC, the fan speed output is 37% (22Hz) from the VFD by default; and at 10VDC the fan speed output is 100% (60Hz). The control scales the 0-10VDC VFD output from the RTM linearly to control between the % range. The VFD will modulate the supply fan motor speed, accelerating or decelerating as required to maintain the zone temperature to the zone temperature setpoint. When subjected to high ambient return conditions the VFD will reduce its output frequency to maintain operation. Bypass control is offered to provide full nominal airflow in the event of drive failure. Ventilation Control Units configured for Single Zone VAV control will require special handling of the OA Damper Minimum Position control in order to compensate for the non-linearity of airflow associated with the variable supply fan speed and damper combinations. Units configured fortraq with or without DCV will operate identically to traditional units with no control changes. Space Pressure Control For units configured with Space Pressure Control with or without Statitrac, the new schemes implemented for economizer minimum position handling require changes to the existing Space Pressure Control scheme in order to prevent over/under pressurization. The overall scheme will remain very similar to VAV units with Space Pressure Control with the exception of the dynamic Exhaust Enable Setpoint. For SZVAV an Exhaust Enable Setpoint must be selected during the 100% Fan Speed Command. Once selected, the difference between the Exhaust Enable Setpoint and Design OA Damper Minimum Position at 100% Fan Speed Command will be calculated.the difference calculated will be used as an offset and added to the Active Building Design OA Minimum PositionTarget in order to calculate the dynamic Exhaust EnableTarget, which will be used throughout the Supply Fan Speed/OA Damper Position range. The Exhaust EnableTarget could be above or below the Active Building Design OA Minimum PositionTarget Setpoint, based on the Active Exhaust Enable Setpoint being set above or below the Building Design Minimum Position at 100% Fan Speed Command. Note that an Exhaust Enable Setpoint of 0% will result in the same effect on Exhaust Fan control as on VAV applications with and without Statitrac. Occupied Cooling Operation For normal cooling operation, cooling capacity will be staged or modulated in order to meet the calculated discharge air target setpoint. If the current active cooling capacity is controlling the discharge air within the deadband, no additional cooling capacity change will be requested. As the Discharge AirTemperature rises above the deadband, the algorithm will request additional capacity as required (additional compressors or economizer). As the Discharge AirTemperature falls below the deadband, the algorithm will request a reduction in active capacity. Default Economizer Operation By default, the unit will be setup to optimize the minimum supply fan speed capability during Economizer Only operation. If the economizer is able to meet the demand alone, due to desirable ambient conditions, the supply fan speed will be allowed to increase above the minimum prior to utilizing mechanical cooling if discharge air setpoint falls below the discharge air Lower Limit (Cooling) setpoint. Unoccupied Mode In Unoccupied mode the unit will utilize setback setpoints, 0% Minimum OA Damper position, and Auto Fan Mode operation as on normal CV units.the Supply Fan speed, and cooling and modulating types of heat, will be controlled to the discharge air target setpoint as is done during occupied periods. The Supply fan speed during staged heat control will be forced to 100% as on normal CV units. Occupied Heating Operation Occupied heating operation has two separate control sequences; staged and modulated. All staged heating types will drive the supply fan to maximum flow and stage heating to control to the Zone Heating Setpoint. For units with Hydronic and Gas heat, modulated SZVAV Heating. On an initial call for heating, the supply fan will drive to the minimum heating airflow. On an additional call for heating, the heat will control in order to meet the calculated discharge air target setpoint. As the load in the zone continues to request heat operation, the supply fan will ramp-up while the control maintains the heating discharge air temperature. Heating can be configured for either the energy saving SZVAV Heating solution as described above, or the traditional, less efficient CV Heating solution. RT-SVX35G-EN 13

14 General Information Compressor (DX) Cooling Compressor control and protection schemes will function identical to that of a traditional unit. Normal compressor proving and disable input monitoring will remain in effect as well as normal 3-minute minimum on, off, and interstage timers. Also, all existing head pressure control schemes will be in effect. Cooling Sequence If the control determines that there is a need for active cooling capacity in order to meet the calculated discharge air target setpoint, once supply fan proving has been made, the unit will begin to stage compressors accordingly. Note that the compressor staging order will be based on unit configuration and compressor lead/lag status. Once the discharge air target setpoint calculation has reached the Minimum Setpoint and compressors are being utilized to meet the demand, as the discharge air target setpoint value continues to calculate lower the algorithm will begin to ramp the supply fan speed up toward 100%. Note that the supply fan speed will remain at the compressor stage s associated minimum value (as described below) until the discharge air target setpoint value is calculated below the discharge air temperature Minimum Setpoint (limited discharge air target setpoint). As the cooling load in the zone decreases the zone cooling algorithm will reduce the speed of the fan down to minimum per compressor stage and control the compressors accordingly. As the compressors begin to de-energize, the supply fan speed will fall back to the Cooling Stage s associated minimum fan speed, but not below. As the load in the zone continues to drop, cooling capacity will be reduced in order to maintain the discharge air within the ± ½ discharge air target deadband. 14 RT-SVX35G-EN

15 General Information Figure 1. Unit component layout and ship with locations RT-SVX35G-EN 15

16 Installation Unit Inspection As soon as the unit arrives at the job site Verify that the nameplate data matches the data on the sales order and bill of lading (including electrical data). Verify that the power supply complies with the unit nameplate specifications. Verify that the power supply complies with the electric heater specifications on the unit nameplate. Visually inspect the exterior of the unit, including the roof, for signs of shipping damage. Check for material shortages. Refer to the Component Layout and Ship with Location illustration, (Figure 1, p. 15). Note: If the job site inspection of the unit reveals damage or material shortages, file a claim with the carrier immediately. Specify the type and extent of the damage on the "bill of lading" before signing. Visually inspect the internal components for shipping damage as soon as possible after delivery and before it is stored. Do Not walk on the sheet metal base pans. WARNING No Step Surface! Do not walk on the sheet metal drain pan. Walking on the drain pan could cause the supporting metal to collapse, resulting in the operator/technician to fall. Failure to follow this recommendation could result in death or serious injury. Note: Do not use the unit's heater for temporary heat without first completing the start-up procedure detailed under "Starting the Unit". Trane will not assume any responsibility for equipment damage resulting from condensate accumulation on the unit's electrical and/or mechanical components. Unit Clearances Figure 3, p. 18 illustrates the minimum operating and service clearances for either a single or multiple unit installation.these clearances are the minimum distances necessary to assure adequate serviceability, cataloged unit capacity, and peak operating efficiency. Providing less than the recommended clearances may result in "short-circuiting" of exhaust and economizer airflows. Unit Dimensions & Weight Information Overall unit dimensional data for the W_HE unit is illustrated in Figure 4, p. 19. A Center-of-Gravity illustration and the dimensional data is shown in Table 4, p. 25. Table 6, p. 30 lists the typical unit and curb operating weights.weights shown represent approximate operating weights. Actual weights are stamped on the unit nameplate. If concealed damage is discovered, notify the carrier s terminal of damage immediately by phone and by mail. Concealed damage must be reported within 15 days. Request an immediate joint inspection of the damage by the carrier and the consignee. Do not remove damaged material from the receiving location. Take photos of the damage, if possible.the owner must provide reasonable evidence that the damage did not occur after delivery. Storage Take precautions to prevent condensate from forming inside the unit s electrical compartments and motors if: a. The unit is stored before it is installed; or, b. The unit is set on the roof curb, and temporary heat is provided in the building. Isolate all side panel service entrances and base pan openings (e.g., conduit holes, S/A and R/A openings, and flue openings) from the ambient air until the unit is ready for start-up. 16 RT-SVX35G-EN

17 Installation Figure 2. Typical control module location RT-SVX35G-EN 17

18 Installation Figure 3. Typical W_HE casings 2 through 9 clearances for single or multiple unit installation Legend A = Return Air Opening B = Fresh Air Intake C = Supply Air Opening E = Optional /4 Access Door (180 swing) F = Hinged /4 Filter Access Door (180 swing) G = Hinged /4 Heater Access Door (180 swing) H = Hinged /4 Supply Fan Access Door (180 swing) (90 thru 130 Ton) J = Hinged 2 4 1/2 Control Panel Door (180 swing) (90 thru 130 Ton) K = VFD Access Panel Notes: 2. A minimum clearance of 2 4-1/2 is required to open the hinged control panel doors on Casing 9, ton units. 3. Increase the clearance between staggered units by 150% of the minimum clearance for a single unit installation (i.e clearance for Casing 2-6, ton units). A minimum clearance of 16 0 is required if the units are not staggered minimum clearance for Casing 2-6, ton units. 8 minimum clearance for Casing 9, ton units. Staggering the units: a. minimizes span deflection which deters sound transmission; and b. maximizes proper diffusion of the exhaust air before it reaches the adjacent unit s fresh air intake. 18 RT-SVX35G-EN